Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Settlements	$ 102	$ 43	$ 62
Pension Plans Defined Benefit [Member] | U.S. [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	73	85	79
Interest cost	53	66	79
Expected return on plan assets	(80)	(85)	(74)
Amortization of prior service cost (credit)	0	0	0
Recognized net actuarial (gain) loss	43	51	54
Settlements	102	44	62
Curtailments	12	0	0
Net periodic benefit cost	203	161	200
Pension Plans Defined Benefit [Member] | Int'l (Pension Benefits) [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	61	54	69
Interest cost	79	85	97
Expected return on plan assets	(120)	(145)	(138)
Amortization of prior service cost (credit)	(1)	(1)	(2)
Recognized net actuarial (gain) loss	33	22	32
Settlements	0	(1)	0
Curtailments	0	0	0
Net periodic benefit cost	52	14	58
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	2	2	1
Interest cost	4	6	8
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(37)	(31)	(33)
Recognized net actuarial (gain) loss	0	1	(2)
Settlements	0	0	0
Curtailments	0	0	0
Net periodic benefit cost	$ (31)	$ (22)	$ (26)